<!DOCTYPE html>
<html>
    <head>
        <title>SourceBuffer.mode == "sequence" test cases.</title>
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
        <script src="mediasource-util.js"></script>
    </head>
    <body>
        <div id="log"></div>
        <script>
          function mediasource_sequencemode_test(testFunction, description, options)
          {
              return mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
              {
                  assert_greater_than(segmentInfo.media.length, 3, "at least 3 media segments for supported type");
                  test.failOnEvent(mediaElement, "error");
                  sourceBuffer.mode = "sequence";
                  assert_equals(sourceBuffer.mode, "sequence", "mode after setting it to \"sequence\"");

                  var initSegment = MediaSourceUtil.extractSegmentData(mediaData, segmentInfo.init);
                  test.expectEvent(sourceBuffer, "updatestart", "initSegment append started.");
                  test.expectEvent(sourceBuffer, "update", "initSegment append success.");
                  test.expectEvent(sourceBuffer, "updateend", "initSegment append ended.");
                  sourceBuffer.appendBuffer(initSegment);
                  test.waitForExpectedEvents(function()
                  {
                      assert_equals(sourceBuffer.timestampOffset, 0, "timestampOffset initially 0");
                      testFunction(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData);
                  });
              }, description, options);
          }

          function append_segment(test, sourceBuffer, mediaData, info, callback)
          {
              var mediaSegment = MediaSourceUtil.extractSegmentData(mediaData, info);
              test.expectEvent(sourceBuffer, "updatestart", "media segment append started.");
              test.expectEvent(sourceBuffer, "update", "media segment append success.");
              test.expectEvent(sourceBuffer, "updateend", "media segment append ended.");
              sourceBuffer.appendBuffer(mediaSegment);
              test.waitForExpectedEvents(callback);
          }

          function threeDecimalPlaces(number)
          {
              return Number(number.toFixed(3));
          }

          // Verifies expected times to 3 decimal places before and after mediaSource.endOfStream(),
          // and calls |callback| on success.
          function verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                              expectedTimestampOffset, expectedBufferedRangeStartTime,
                                              expectedBufferedRangeMaxEndTimeBeforeEOS,
                                              expectedBufferedRangeEndTimeAfterEOS,
                                              callback) {
              assert_equals(threeDecimalPlaces(sourceBuffer.timestampOffset),
                            threeDecimalPlaces(expectedTimestampOffset),
                            "expectedTimestampOffset");

              // Prior to EOS, the buffered range end time may not have fully reached the next media
              // segment's timecode (adjusted by any timestampOffset). It should not exceed it though.
              // Therefore, an exact assertBufferedEquals() will not work here.
              assert_equals(sourceBuffer.buffered.length, 1, "sourceBuffer.buffered has 1 range before EOS");
              assert_equals(threeDecimalPlaces(sourceBuffer.buffered.start(0)),
                            threeDecimalPlaces(expectedBufferedRangeStartTime),
                            "sourceBuffer.buffered range begins where expected before EOS");
              assert_less_than_equal(threeDecimalPlaces(sourceBuffer.buffered.end(0)),
                                     threeDecimalPlaces(expectedBufferedRangeMaxEndTimeBeforeEOS),
                                     "sourceBuffer.buffered range ends at or before expected upper bound before EOS");

              test.expectEvent(mediaSource, "sourceended", "mediaSource endOfStream");
              mediaSource.endOfStream();
              test.waitForExpectedEvents(function()
              {
                  assertBufferedEquals(sourceBuffer,
                                       "{ [" + expectedBufferedRangeStartTime.toFixed(3) + ", " + expectedBufferedRangeEndTimeAfterEOS.toFixed(3) + ") }",
                                       "sourceBuffer.buffered after EOS");
                  callback();
              });
          }

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              assert_equals(segmentInfo.media[0].timecode, 0, "segment starts at time 0");
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[0], function()
              {
                  verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                             0, 0,
                                             segmentInfo.media[1].timecode + sourceBuffer.timestampOffset,
                                             segmentInfo.media[0].highest_end_time + sourceBuffer.timestampOffset,
                                             test.done);
              });
          }, "Test sequence AppendMode appendBuffer(first media segment)");

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              assert_greater_than(segmentInfo.media[1].timecode, 0, "segment starts after time 0");
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[1], function()
              {
                  verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                             -segmentInfo.media[1].timecode, 0,
                                             segmentInfo.media[2].timecode + sourceBuffer.timestampOffset,
                                             segmentInfo.media[1].highest_end_time + sourceBuffer.timestampOffset,
                                             test.done);
              });
          }, "Test sequence AppendMode appendBuffer(second media segment)");

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              assert_greater_than(segmentInfo.media[1].timecode, 0, "segment starts after time 0");
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[1], function()
              {
                  assert_equals(segmentInfo.media[0].timecode, 0, "segment starts at time 0");
                  append_segment(test, sourceBuffer, mediaData, segmentInfo.media[0], function()
                  {
                      // Current timestampOffset should reflect offset required to put media[0]
                      // immediately after media[1]'s highest frame end timestamp (as was adjusted
                      // by an earlier timestampOffset).
                      verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                                 segmentInfo.media[1].highest_end_time - segmentInfo.media[1].timecode, 0,
                                                 segmentInfo.media[1].timecode + sourceBuffer.timestampOffset,
                                                 segmentInfo.media[0].highest_end_time + sourceBuffer.timestampOffset,
                                                 test.done);
                  })
              });
          }, "Test sequence AppendMode appendBuffer(second media segment, then first media segment)");
        </script>
    </body>
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